The Siemens 3RU2126-1EB00-8K is a dependable thermal overload relay from the renowned SIRIUS 3RU2 Series, engineered to provide reliable protection for three-phase motors against overload conditions, phase failure, and prolonged overcurrent operation. Featuring an adjustable current setting range of 2.2–3.2 A, Class 10 tripping characteristics, and compatibility with Size S0 Siemens contactors, this relay is ideally suited for industrial motor control systems, automation equipment, and compact motor starter assemblies.
Using Siemens' proven thermal overload protection technology, the relay continuously monitors motor current and responds to overload conditions through an inverse-time delayed tripping mechanism. This helps prevent motor overheating, insulation damage, and costly downtime while allowing normal motor starting currents. Integrated phase-failure sensitivity further enhances motor protection and operational reliability.
The Variant EB008K offers an adjustable overload release setting of 2.2–3.2 A, making it suitable for protecting small three-phase motors used in pumps, fans, conveyors, compressors, packaging machinery, HVAC systems, machine tools, and other industrial automation applications. Its compact S0 frame size allows direct mounting onto compatible Siemens contactors, reducing installation space and simplifying panel design.
As part of the Siemens SIRIUS motor protection portfolio, the 3RU2126-1EB00-8K supports both manual and automatic reset modes and includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact for signaling, monitoring, and control circuit integration. Durable screw-type terminal connections ensure secure wiring and simplified maintenance.
Manufactured according to Siemens' stringent quality standards, the 3RU2126-1EB00-8K delivers long service life, dependable operation, and consistent motor protection in demanding industrial environments.
| Specification | Details |
|---|---|
| Product Name | Thermal Overload Relay |
| Part Number | 3RU2126-1EB00-8K |
| SKU | 3RU2126-1EB00-8K |
| Brand | Siemens |
| Product Family | SIRIUS 3RU2 |
| Product Type | Motor Protection Relay |
| Variant | EB008K |
| Current Setting Range | 2.2–3.2 A |
| Relay Size | S0 |
| Trip Class | Class 10 |
| Operating Principle | Thermal |
| Mounting Type | Direct Contactor Mounting |
| Main Circuit Connection | Screw Terminal |
| Auxiliary Contacts | 1 NO + 1 NC |
| Reset Type | Manual / Automatic |
| Rated Insulation Voltage | 690 V |
| Operating Frequency | 50/60 Hz |
| Number of Main Poles | 3 |
| Protection Features | Overload & Phase Failure Protection |
| Application | Industrial Motor Protection |
| Manufacturer | Siemens |
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